<?php
//淘宝接口：根据ip获取所在城市名称
function getCity()
{

    $ip = getIp();
    if (!$ip) {
        return "";
    }
    $url = "http://ip.taobao.com/service/getIpInfo.php?ip={$ip}";
    $ret = https_request($url);
    $arr = json_decode($ret, true);
    if (isset($arr['data']['city'])) {
        return $arr['data']['city'];
    }
    return "";
}

//POST请求函数
function https_request($url, $data = null)
{
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);

    if (!empty($data)) {//如果有数据传入数据
        curl_setopt($curl, CURLOPT_POST, 1);//CURLOPT_POST 模拟post请求
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);//传入数据
    }

    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    $output = curl_exec($curl);
    curl_close($curl);
    return $output;
}

// 获取ip
function getIp()
{
    $realip = '';
    $unknown = 'unknown';
    if (isset($_SERVER)) {
        if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && !empty($_SERVER['HTTP_X_FORWARDED_FOR']) && strcasecmp($_SERVER['HTTP_X_FORWARDED_FOR'], $unknown)) {
            $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
            foreach ($arr as $ip) {
                $ip = trim($ip);
                if ($ip != 'unknown') {
                    $realip = $ip;
                    break;
                }
            }
        } else if (isset($_SERVER['HTTP_CLIENT_IP']) && !empty($_SERVER['HTTP_CLIENT_IP']) && strcasecmp($_SERVER['HTTP_CLIENT_IP'], $unknown)) {
            $realip = $_SERVER['HTTP_CLIENT_IP'];
        } else if (isset($_SERVER['REMOTE_ADDR']) && !empty($_SERVER['REMOTE_ADDR']) && strcasecmp($_SERVER['REMOTE_ADDR'], $unknown)) {
            $realip = $_SERVER['REMOTE_ADDR'];
        } else {
            $realip = $unknown;
        }
    } else {
        if (getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), $unknown)) {
            $realip = getenv("HTTP_X_FORWARDED_FOR");
        } else if (getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), $unknown)) {
            $realip = getenv("HTTP_CLIENT_IP");
        } else if (getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), $unknown)) {
            $realip = getenv("REMOTE_ADDR");
        } else {
            $realip = $unknown;
        }
    }
    $realip = preg_match("/[\d\.]{7,15}/", $realip, $matches) ? $matches[0] : $unknown;
    return $realip;
}
$getCity=getCity();
?>